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Synthesis and Characterization of Well‐Defined Block Copolymers by Combing Controlled Radical and Cationic Polymerization
Author(s) -
Ibrahim Saber,
Voit Brigitte
Publication year - 2009
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200950107
Subject(s) - copolymer , cationic polymerization , polymer chemistry , nitroxide mediated radical polymerization , polymerization , living polymerization , styrene , radical polymerization , polystyrene , living free radical polymerization , reversible addition−fragmentation chain transfer polymerization , materials science , anionic addition polymerization , living cationic polymerization , oxazoline , chain transfer , ionic polymerization , living anionic polymerization , chemistry , polymer , organic chemistry , catalysis , composite material
A facile synthetic strategy for well‐defined poly(ethyleneimine)‐polystyrene (PEI‐PS) block copolymers utilizing controlled radical polymerization through the macroinitiator approach is presented. Poly(2‐methyl‐2‐oxazoline) containing an alkoxyamine initiating unit at the chain end was prepared by ring opening cationic polymerization of 2‐methyl‐2‐oxazoline through a nitroxide containing initiator. Polymerization of styrene with the poly(2‐methyl‐2‐oxazoline) macroinitiator was carried out under nitroxide‐mediated radical polymerization (NMRP) conditions. GPC and NMR revealed that the polymerization was accurately controlled and well‐defined polystyrene chains were attached to the chain end of the macroinitiator to give the poly(2‐methyl‐2‐oxazoline‐b‐styrene) block copolymers. Hydrolysis of the poly(2‐methyl‐2‐oxazoline) block resulted effectively in poly(ethyleneimine‐ b ‐styrene) block copolymers.